[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=64891

Tommaso Falchi Delitala <volalto86 at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |volalto86 at gmail.com

--- Comment #46 from Tommaso Falchi Delitala <volalto86 at gmail.com> ---
Created attachment 181501
  --> https://bugzilla.kernel.org/attachment.cgi?id=181501&action=edit
dmesg showing lockpuos (radeon off)

I still experience lockups related to audio with discrete card disabled via
vgaswitcheroo. Moreover the systems hangs at shutdown.

Kernel 4.0.6-1-ARCH
AMD Mobility Radeon HD5470 + intel integrated.


# cat /sys/kernel/debug/vgaswitcheroo/switch 
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynOff:0000:01:00.0
2:DIS-Audio: :Off:0000:01:00.1

Interesting dmesg print:

snd_hda_intel 0000:01:00.1: Disabling via VGA-switcheroo
snd_hda_intel 0000:01:00.1: Cannot lock devices!
INFO: task kworker/u16:0:6 blocked for more than 120 seconds.
      Tainted: G        W       4.0.6-1-ARCH #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u16:0   D ffff880132fd7ca8     0     6      2 0x00000000
Workqueue: hd-audio1 hdmi_repoll_eld [snd_hda_codec_hdmi]


See complete dmesg in attachment.

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